Hammer.



H. M STURGEON.

HAMMER. APPLICATION FILED JULY 26,19IT- Patented Apr. 15,1919.

To all whom it may concerm] reference marked thereon, forming part of proved hammer mechanism.

TE l- SATES ATE FFICE.

HAROLD M. S'IURGEON, OF ERIE, PENNSYLVANIA.

HAMMER.

Specification of Letters Patent. 7

Application filed July 26, 1917. Serial No. 182,927.

Be it known that I, HAROLD M. STURGEON, a citizen of the United States, residing at Erie, in the county of Erie, and State of Pennsylvania, have invented certain new and useful Improvements in Hammers; and

I do [hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of this specification.

My invention relates to mechanical hammers, and the object thereof is to provide a hammer mechanism which can be operated by an electric motor. or other source of power, and in which the length of the stroke I of the hammer and the power thereof is. controlled by the ressure which the-operator exerts against t e work.

The features of my invention will be hereinafter fullydescribed and pointed out, and

are illustrated in the accompanying drawings, in which Figure 1, 1s a side elevation of my im- Fig. 2, is alongitu'dinal central section of the same.

Fig. 3, is a like section of a portion of the shell, showing mechanism therein in elevation in position for a partial stroke of the hammer.

Fig. 4., is alike view showing the hammer in position for a full stroke.

Fig. 5, is a transverse section on the line 55 in Fig. 2.

Fig. 6, is a transverse section on the line 6-6 in Fig. 3.

Fig. 7, is a transversesection on the line 7-7 in Fig. 4:. Y

' In these drawings A'indicates the shell of the hammer frame, the ends of which are tudinal openin vented from'rotating in the shell A by means of a longitudinal bar a (see Fig. 5) secured against the inner wall of the shell A and working in a. longitudinal slot in the side of the hammer C. The hammer C is provided with a diagonal slot C throu hthe wall thereof, and substantially onealf of the circumference of the hammer C.

Within the hammer C is placed a thimblellke shell 1) in the wall of which is secured the axle D of, a pair of rollers d and d, the roller d being in the diagonal slot C in the hammer C. Within the thimble-like shell D there is an annular helical cam E which is adapted to engage the roller d as hereinafter described, said cam being rovi'ded with a hollowshaft E, which sli ably fitsv over the inner end of the shaft B, said hollow shaft having slots 6 6 see Figs. 3 and 4) through 0 posite. walls t ereof to receive the ends 0 a transverse pin 6' (see Fig. 2)

Patented Apr. 15, 1919.-

secured through the inner end of the shaft B, and within the hollow shaft E is a spring. E adapted to maintain the cam. E and its hollow shaft in its most extended position, as shown in Fig-- 2. The bottom of the thimble-like shell D is provided with a square hole (Z therethrough, and the closed end of thehammer is provided with a round hole 0 therethrough. Theclosure A is provided with a boss A. having a central opening thereflhrough, in which there is slidably and rotatably mounted a short shaft-F which is provided with a helical slot 7 in which a roller f, mounted u on a pivot screw f, secured in the wall 0 the boss A operates.

Integrally secured to the inner end ofthe shaft F is a square bar G which extends inwiardly through the round opening 0 in the end of the hammer C and through the square I opening in the thimble I) when it is provided with a washer Gf which is provided with a square recess adapted to fit over the end of the square bar G, said washer G engaging the lower end of the cam E, the spring F1 operating to force the cam E downward against the washer G. and thereby maintain the square bar Grand shaft F in their normal position as shown in Fig. 2.

Upon the boss A is secured a tapering sleeve H and in the outer end of the sleeve H is slida'bly mounted a tool stock J which is prevented from rotating therein by means of a spline J operating in a groove in the sleeve H. The inner end of the tool stock J is provided with a stud-post j (see Fig. 4.)

pressed against the work, which pressure forces the tool stock J and shaft F and square bar G inwardly thereby forcing the cam E upwardly so that the cam surface.

thereon will engage the roller 03 and at the same time the helical slot" f in the shaft F causesthe shaft F and square bar G to turn in the same direction, as the cam E is rotating, thereby revolving the thimble D which carries the roller d around in the diagonal slot C in the wall of the hannner C a quarter of a revolution, (as shown in Figs. 3 and 6) or a half revolution, (as shown in Figs. 4: and 7) when the tool stock J ispushed in as far as it will go.

When the mechanism is in the position shown in Figs. 2 and 5, the cam will not lift the hammer C and thimble D; when in the position shown in Figs. 3 and 6,.the cam lifts the hammer one-half of a stroke; and when in the 'osition shown in Figs. 4 and 7, the cam 11 s the hammer the full length of the stroke. Between the closure A." and the hammer 0 there is a spring K the inner end of which enters a thimble K within the open end of the hammer and is provided with a radial flange which overlaps the end of the hammer, and with an inturned flange at the other end thereof upon which the spring K is seated. The spring K operates to force the hammer C forward when the roller 05' rolls off of the apex of the cam E and the tension of said spring is increased as the hammer G is forced upward in the shell A by the tool stock and shaft F shift ing the roller d around in the diagonal slot C. 1

' The hammer 0 when in the position shown in Fig. 4 has compressed the spring K as shown, and then is raised the full length of its stroke by the cam E away from the shaft F and the spring K when the roller d passes the apex of the cam E drives the hammer forward against the shaft F through which the force of the blow is imparted to the tool stock J. The rotation of the shaft F and bar G. causes the thimble D to rotate within the hammer C which rotation carries the rollers d and at around the axis of the hammer, and the diagonal slot C causes said rollers to move longitudinally toward the front end of the hammer so that as the tool stock J and shaft F and the cam E are ushed inward, the hammer C also moves inward, but the normal position, longitudinally, of the rollers d and d remains the same, so that as the cam E moves inward, the length of the stroke of the ham- I from and'outwardly into t mer is increased by reason of the cam E engaging the roller (1! earlier in its rotation'.

Having thus fully described my invention so as to enableothers to utilize the same, I i

do not desire to be limited to the exact construction and arrangement shown, as many changes can be made therein without departing from the scope of my invention as defined in the claims.

Therefore what I claim as new and desire to. secure by Letters Patent is:

1. In a device of the class frame, a hollow spring-pressed reciprocating hammer, a helical cam withinsaid hammer, means co-engaging said hammer and described, a

said cam, a longitudinally movable tool'- frame, a hollow spring-pressed reciprocat-" ing hammer therein, a spring-pressed, rotatable and longitudinally movable helical cam within said hammer, longitudinally movable means adapted to co-engage'said hammer and said cam, a longitudinally slidabletool-stock mounted in said frame,

means mounted between said tool-stock and 7 said hammer adapted to be operated by the longitudinal movement of said tool-stock to control the longitudinal position of said cam with relation to said hammer, and means to oausesaid cam to rotate, substantially as set forth.

3. In a device of the class described, .a

ing hammer non-rotatable in said frame .frame, a hollow spring-pressed reciprocathaving a helical slot in the wall thereof, and

a round opening in the front end thereof, a thimble rotatably mounted in said hammer, and having an opening in the front end thereof, a stud post'secured in the wall of said thimble and projectin inwardly thereit} helical slot in said hammer, rollers on the inner and outer ends of said stud-post, a driven shaft mounted in said frame, a spring-pressed, helical cam within said thimble slidably and nonrotatably secured on said driven shaft and adapted to engage the stud-roller on the inside of said thimble, means to rotate said driven shaft, a slidable member mounted in said frame and adapted to receive blows from said hammer, means to cause said slidable member tofrotate during its longi-' tudinal movement, means secured. to said slidable member and extending through said round opening in the front end of said hammer, and non-rotatably through the opening in said thimble and engaging the front; end of said helical cam, whereby said thimble is caused to rotate within said hammer and said helical cam is moved longitudinally therein, and a tool-stock slidably secured in said frame and engaged by said slidable member, substantially as set forth.

l. In a device of the class described, a frame, a hollow, spring-pressed reciprocating hammer having an opening in its front end slidably and non-rotatably mounted in said frame, said hammer having a helical slot in the wallthereof, a thimble rotatably mounted in said hammer, a stud-roller pivoted on the exterior of said thimble and projecting into said helical slot, a stud-roller pivoted on the interior Wall of said thimble, a driven shaft axially mounted in said frame, a helical cam in said thimble adapted to engage the stud roller on the interior of said thimble, a hollow shaft for said cam and telescoping over said driven shaft, a spring in said hollow-shaft to normally maintain said cam in its outermost position, a short shaft slidably mounted in said frame in axial alinement with said hammer, a bar axially secured on said short shaft extending inwardly through the opening in the front end of said hammer and slidably and nonrotatably passing through the bottom of said thimble and contacting against the end of said helical cam, means to cause said short shaft to rotate during its longitudinal movement, and a tool-stock slidably mounted in the frame in axial alinement with said short shaft and hammer, and contacting against said short shaft, whereby, as the tool-stock is caused to move inwardly by pressure against the work, said helical cam is moved longitudinally and said thimble caused to rotate Within said hammer to move said stud-rollers forward in the helical slot in. said hammer to increase the length of the 4 stroke of said hammer, substantially as set forth.

In testimony whereof I aflix my signature.

HAROLD M. STURGEON. 

